Piezo Sound Element for Integrated Audio and Motion Sensing
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Solution Overview
Problem
Conventional display devices require separate speakers for sound generation and touch sensors, adding cost and complexity, while lacking integrated capabilities for haptic feedback and motion sensing.
Innovation Solution
A display device incorporating a sound element with a vibrating material layer and electrodes between cushion tapes, which generates sound and detects touch or motion without additional components, using piezo materials like PVDF or PZT, and leveraging the Doppler effect for motion sensing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a separate speaker is provided to generate sound, then sound generation capability is improved, but device complexity and cost increase
Solution Approach 1:
The patent merges the sound generation function with the existing display panel structure by integrating a sound element between the liquid crystal panel and the rear chassis. This eliminates the need for a separate speaker component while maintaining sound generation capability, directly resolving the contradiction between versatility and device complexity
Solution Approach 2:
The display panel structure is designed to serve multiple functions: displaying images and generating sound. The sound element is integrated into the existing panel architecture, allowing the same device structure to perform both display and audio functions, thereby improving versatility without increasing complexity
2Adaptability or versatility
If a touch sensor is provided to detect touch or motion, then touch detection capability is improved, but device complexity and cost increase
Solution Approach 1:
The sound element is designed to perform dual functions: generating sound through piezoelectric actuation and detecting touch or motion through piezoelectric sensing. This multi-functionality eliminates the need for separate touch sensor components, resolving the contradiction between versatility and device complexity
Solution Approach 2:
The sound element serves itself by using the same piezoelectric material and structure for both actuation (sound generation) and sensing (touch detection). This self-service capability reduces the need for additional components and simplifies the overall device architecture
3Reliability
If cushion tapes are used to protect the rear surface of the display panel, then protection capability is improved, but the space for integrating additional components is reduced
Solution Approach 1:
The cushion tapes are merged with the sound element integration structure. The first and second cushion tapes are positioned to protect the rear surface while creating a designated space between them for housing the sound element, thus achieving both protection and component integration without compromising either function
Solution Approach 2:
The cushion protection structure is segmented into multiple parts (first cushion tape, second cushion tape) that create distinct functional zones: one for protection and another for housing the sound element. This segmentation allows both protection capability and component integration to coexist
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables sound generation and touch/motion detection without external speakers or touch panels, improving cost-effectiveness and integrating haptic feedback and motion sensing functions.
Implementation Method 1
a sound element which is disposed between the first cushion tape and the second cushion tape and includes a pair of electrodes and a vibrating material layer disposed between the pair of electrodes
Implementation Method 2
the sound wave may be modulated by the Doppler effect in accordance with a motion of a user, relative to the display device
Data Source
AI summary
A display device includes a display panel which displays an image, a cushion tape member which is disposed below the display panel to protect a rear surface of the display panel, and includes a first cushion tape and a second cushion tape, a sound element which is disposed between the first cushion tape and the second cushion tape, and includes a pair of electrodes and a vibrating material layer disposed between the pair of electrodes.